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Biology · 2022 · 2 marks
CBSE 2022 · Region 4 · Set 1 · Q2
(a) Mention the common bacterium found in the anaerobic sludge during sewage treatment and also in the rumen of cattle. How is this bacterium…
(a)
Mention the common bacterium found in the anaerobic sludge during sewage treatment and also in the rumen of cattle. How is this bacterium commercially useful ?
OR
(b)
Name the effective biocontrol agents of several plant pathogens belonging to group of viruses. Also write about the ways they support the environment.
Marking-scheme solution
(a)
●Methanobacterium/Methanogen - It helps in production of biogas/gobar gas OR (b) ●Baculoviruses / Nucleopolyhedrovirus -Species specific, narrow spectrum insecticidal application, no negative impact on plants / vertebrates / non-target insects, help to conserve beneficial insects, useful in IPM, useful in ecologically sensitive area
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CBSE Class 12 Biology past-paper question from the 2022 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.